The probability that he did not roll a prime number on either die is 1/4.
What is probability?
The area of mathematics known as probability deals with numerical representations of the likelihood that an event will occur or that a statement is true. An event's probability is a number between 0 and 1, where, broadly speaking, 0 denotes the event's impossibility and 1 denotes certainty.
Probability is simply how likely something is to happen. Whenever we're unsure about the outcome of an event, we can talk about the probabilities of certain outcomes—how likely they are. The analysis of events governed by probability is called statistics.
There are three numbers that are not prime: 1, 4, 6.
So the probability that he did not roll a prime number on either die is
1/2*1/2=1/4.
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